What is Quantum Electrodynamics (QED)?
Quantum electrodynamics (QED) is the quantum field theory explaining how electrically charged particles interact with each other through the exchange of photons (light \”quanta\”, or little packets of light). QED is referred to as a gauge theory, with a mathematically specified gauge field representing the electromagnetic force. The theory also explains magnetism, as magnetism and electricity are two manifestations of the same underlying force, electromagnetism. The theory of QED is one of the most well-verified theories on Earth, sometimes giving precise results to ten decimal places, and was the first quantum field theory to be called consistent and complete. One prediction made by QED was found to be accurate up to .0038 parts per million, probably the most precise and accurate physical prediction ever made. Computing correct solutions to the behavior of systems with interacting parts or larger electron orbitals gets exponentially harder as the number of components increases, with s
